Yes PETG can be rather odd stuff (IMHO) but actually I print with it quite often.
In fact that is what is in my printer right now and the last half dozen parts I have printed were using PETG.
It does form hair fine strings much more readily than other materials, or at least it has done so for me.
The blobbing may be that the temperature is too high or the speed is too slow.
Also, be sure to use retraction on the extruder whenever it is not actually printing or during Z-hops.
I do a 5mm retraction at the end of the print but it will still form blobs at the nozzle tip as it cools down.
I do very careful measurements of the filament diameter.
The material I am running (Zyltech) runs about 1.79-1.80mm diameter, so that is about 2% in cross-section area over the ideal 1.75mm setting in my slicer (Cura).
So I just run the slicer at 98% flow rate to compensate.
I have had no layer adhesion problems doing it this way.
For bed adhesion I run a mirror tile, then hairspray followed by a very thin coating of ABS juice.
The printed parts stick like mad to the tile (even ABS ones).
FWIW... I still strongly prefer to print "structural" things from ABS and don't use PLA all that often.
For PETG I am running at about 75mm/sec print speed, 220C hot end, 80C bed, and full speed part cooling fan after the 3rd layer, if it helps any.
And in the slicer I only run about 0.5% overlap between the fill and the walls to avoid patterning the walls.
Also, you might want to run 3-4 line widths for the outer walls so they are stiffer and print the fill after the walls if your slicer will allow it.
Without using the cooling fan the layers are a complete saggy mess with PETG, by the way.
And if you have not done so, you may need to test the accuracy of the hot end temperature using a contact-style temperature probe.
Doing that a while back I found that it was off by quite a lot and after correcting it in the firmware many problems went away.
To "de-string" the finished PETG parts I do the usual trimming with a deburring tool and then I wave a butane charcoal lighter over the part sparingly..!
A little wet sanding followed with a gentle wipe down using carburetor cleaner on a paper towel and the parts typically come out shiny and smooth.
I hope this helps.
